* removed hack folder and with it all code to install deps
* reworked `make build` to show more explicitly what needs to be done when
  producing an artifact
* bumped node version dep to v14 (to make jest work again)
* adjusted readme
* suppress console output when running jest client tests

* update server and client package dependencies due to CVE notifications
* update runtime dependencies
* add some information to various readmes (e.g. about the client being part of the bundle)

* adjust app readme
* revert change in server 'scripts'
* renamed 'stack' into 'hack' and split up Makefile into two to better separate
  devops scenarios from scoped deps management
* updated readme according to the make target changes

* update mongoose, jest and nodemon to address security alerts triggered
  by dependabot
* 'test' target had a bug introduced by using wrong syntax
* renamed server scripts to clarify the distinction between invocations
  in local development, CI and actual operations

* npm is a symlink in the node artifact, so, extracting only the symlink
  is no good if its actual target is not there. Now, the whole `node_modules`
  is extracted instead, and a symlink is created explicitly
* remove wildcards to avoid necessity of `--wildcards`, which is not
  supported by BSD tar
* minor phrasing

* adjust mongoose configuration
* documents more make targets in readme
* applied npm scripts convention of the client to the corresponding
  server scripts in order to be more consistent (`start` is now meant
  for local development)

* tech stack can be installed locally and will be used by app-related
  targets if available
* bumped minimal required npm version to 6.14 for server and client

* readme files for the repository and the app
* makefile ans the main entry and documentation
* remove create-react-app from client code